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Home -> Community -> Mailing Lists -> Oracle-L -> RE: [oracle-l] A few rman questions
Dan
I very much agree with Ruth that you should get Robert's book. I would say that he provides a number of best practices.
Speaking of best practices, I've got one for you that isn't specific to RMAN. Regardless of your backup method, test your backup configuration periodically. Don't trust an untested backup method.
You don't say which Oracle version you are on. That makes a lot of difference with RMAN.
Robert discusses copies quite a bit. One thing he points out is that with the copy command you must name specific files. Since our main reason for using RMAN was to get incremental backups working, I didn't see what copy would do for me.
For controlfiles, in 8i I had difficulty getting RMAN to cough up the control file from the backup set (RMAN wouldn't work if the instance wasn't mounted, but you can't mount the database unless you have a control file), so I back the control file up after the RMAN backup by having RMAN issue the SQL command. Others on this list report their success on this issue. I understand 9i is much better in this respect, but I haven't had the opportunity to test it.
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
From: Ruth Gramolini [mailto:rgramolini_at_tax.state.vt.us]
Sent: Wednesday, January 28, 2004 7:15 AM
To: oracle-l_at_freelists.org
Subject: RE: [oracle-l] A few rman questions
Dan,
Robert Freeman has written a great rman book but I think the best place to start is with the Backup and Recovery Manual which is part of the Oracle documentation. In order to do point in time or complete recovery you need to have rman backups and controlfile backups. You can set up you rman configuration files to to autocontrolfile backups at the end of every backup and this will make a copy of your controlifle to a place you specify as the last step as well as the normal backup of the controlfile which is contained in a level 0 rman backup. With this feature, the controlfile which has the necessary info can be restored. Have a look at rman configurations in the docs.
Good luck,
Ruth
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Daniel Hanks
Sent: Tuesday, January 27, 2004 4:59 PM
To: oracle-l_at_freelists.org
Subject: [oracle-l] A few rman questions
I'm in the process of revamping our backup system (which is mostly inherited from another DBA), and had a few questions about rman I've come across as I review the system.
"In many cases, copying datafiles is more beneficial than backing them up, since the output is suitable for use without any additional processing. In contrast, you must process a backup set with a restore command before it is usable. So, you can perform media recovery on a datafile copy, but not directly on a backup set, even if it backs up only one datafile and contains a single backup piece."
So am I better off just leaving the controlfiles (since they're small) handled by 'copy' instead of 'backup'? Is having to process a backup set containing one controlfile with a 'restore' command that much of an issue? Maybe making a backup set of a single controlfile is overkill?
2) Are there any "Best practices" documents with respect to rman that list members would recommend?
Thanks again for your helpful comments,
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Wed Jan 28 2004 - 08:36:39 CST
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